活性炭素繊維紙捕集 : ガスクロマトグラフィーによる空中散布された農薬の落下量の測定

概要

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A simple sampling method using an activated carbon fiber paper was developed for GC determination of pesticides deposited on the ground in aerial application. The pesticides investigated were fenitrothion, malathion, tetrachlorvinphos and fenobucarb. Deposited pesticides were collected on a 5 cm×6 cm activated carbon fiber paper (Toyobo KF Paper P-175), and extracted ultrasonically with 3 ml of benzene-ethanol (4 : 1 v/v) for 10 min followed by centrifugation at 3000 rpm for 10 min. An aliquot of the supernatant was analyzed by GC on a 2 m×3 mm i. d. glass column packed with 5% silicone DC-200 on Chromosorb W AW-DMCS (60 to 80 mesh). Detectors used were FTD for fenobucarb and FPD for the other pesticides. The recoveries of the pesticides ranged from 88.2 to 102%. The minimum detectable amounts were 0.75 μg m^<-2> for fenitrothion, 1.5 μg m^<-2> for malathion, 2.6 μg m^<-2> for tetrachlorvinphos and 1.3 μg m^<-2> for fenobucarb. Amounts of deposited pesticides measured by this method ranged from 11.4 to 151 mg m^<-2> within applied areas, and from 1.9 to 2900 μg m^<-2> in areas within 200 m from the boundary of aerial application.
1990-07-05